On Thu, Apr 28, 2011 at 09:30:31PM -0400, Michael Thompson wrote:
  So far:
 Rhode Island Computer Museum
 S/N 517, running, PT08B, PC01, PC02, PC03
 
https://sites.google.com/site/ricmwarehouse/Home/equipment/pdp-8s
 Goodwill Computer Museum
 Nicely restored and running on display
 
http://www.austincomputerworks.org/museum/index.html
 http://www.flickr.com/photos/mightyohm/5334436698/
 Ethan Dicks
 Needs restoration
 Tekniska museet  in stockholm
 Desktop version
http://www.tekniskamuseet.se/download/18.689e694f125720d4ec480001504/Datore…
 Computermuseum der Fakult?t Informatik
 Running, designing a Teletype interface
 
http://pdp-8.de/
 Living Computer Museum
 Two, unrestored
 
http://www.pdpplanet.com
 Computer History Museum
 One, static display
 
http://www.computerhistory.org
 --
 Michael Thompson 
You also have the one described by Mike. It is not his though and might
be one of the above. There is also some links there to others.
http://www.corestore.org/8s.htm
/P